Mason jar lid



FIG. 1 is a perspective view of a mason jar lid showing my new design in an open position;

FIG. 2 is a front view of the mason jar lid of FIG. 1 shown in a closed position;

FIG. 3 is a back view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a perspective view thereof.

The broken lines in the drawings depict portions of the mason jar lid that form no part of the claimed design. 

CLAIM I claim the ornamental design for a mason jar lid, as shown and described. 